Xici Biography·Chapter 10·Full Text
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"Yi" is a book, it is vast and comprehensive. There is the way of heaven, there is the way of human beings, and there is the way of earth. Two of the three talents are combined, so six. The six are not other things, it is the way of the three materials.
The Tao changes, so it is called Yao; the Yao is equal, so it is called Things; the things are mixed, so it is called Wen; the Wen is not appropriate, so good and bad things happen.